Action menu for subreddit combinations

Author: mrboisvert

src/main/java/org/quantumbadger/redreader/fragments/PostListingFragment.java

@@ -74,6 +74,7 @@
 import org.quantumbadger.redreader.reddit.PostSort;
 import org.quantumbadger.redreader.reddit.RedditPostListItem;
 import org.quantumbadger.redreader.reddit.RedditSubredditManager;
+import org.quantumbadger.redreader.reddit.api.RedditAPISubredditCombinationAction;
 import org.quantumbadger.redreader.reddit.api.RedditSubredditSubscriptionManager;
 import org.quantumbadger.redreader.reddit.kthings.JsonUtils;
 import org.quantumbadger.redreader.reddit.kthings.MaybeParseError;
@@ -101,6 +102,7 @@
 import java.text.NumberFormat;
 import java.util.ArrayList;
 import java.util.HashSet;
+import java.util.List;
 import java.util.Locale;
 import java.util.UUID;
 import java.util.concurrent.atomic.AtomicInteger;
@@ -292,7 +294,6 @@ public void onScrolled(
 
 					case FRONTPAGE:
 					case ALL:
-					case SUBREDDIT_COMBINATION:
 					case ALL_SUBTRACTION:
 					case POPULAR:
 						setHeader(
@@ -302,6 +303,12 @@ public void onScrolled(
 						CacheManager.getInstance(context).makeRequest(mRequest);
 						break;
 
+					case SUBREDDIT_COMBINATION:
+						setSubredditCombinationHeader(
+							mPostListingURL.humanReadableName(getActivity(), true),
+							mPostListingURL.humanReadableUrl(),
+							subredditPostListURL.subredditNames());
+
 					case RANDOM:
 					case SUBREDDIT: {
 
@@ -492,6 +499,28 @@ private void setHeader(
 		}
 	}
 
+	private void setSubredditCombinationHeader(
+			@NonNull final String title,
+			@NonNull final String subtitle,
+			@NonNull final List<String> subredditNames) {
+
+		final PostListingHeader postListingHeader = new PostListingHeader(
+				getActivity(),
+				title,
+				subtitle,
+				mPostListingURL,
+				null);
+
+		setHeader(postListingHeader);
+
+		postListingHeader.setOnLongClickListener(view -> {
+			RedditAPISubredditCombinationAction.showActionMenu(
+					getActivity(),
+					subredditNames);
+			return true;
+		});
+	}
+
 	private void setHeader(final View view) {
 		getActivity().runOnUiThread(() -> mPostListingManager.addPostListingHeader(view));
 	}

src/main/java/org/quantumbadger/redreader/reddit/api/RedditAPISubredditCombinationAction.java

@@ -0,0 +1,89 @@
+/*******************************************************************************
+ * This file is part of RedReader.
+ *
+ * RedReader is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * RedReader is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with RedReader.  If not, see <http://www.gnu.org/licenses/>.
+ ******************************************************************************/
+
+package org.quantumbadger.redreader.reddit.api;
+
+import android.content.Context;
+
+import androidx.appcompat.app.AlertDialog;
+import androidx.appcompat.app.AppCompatActivity;
+
+import com.google.android.material.dialog.MaterialAlertDialogBuilder;
+
+import org.quantumbadger.redreader.account.RedditAccount;
+import org.quantumbadger.redreader.account.RedditAccountManager;
+import java.util.ArrayList;
+import java.util.List;
+
+public class RedditAPISubredditCombinationAction {
+
+	public enum SubredditCombinationAction {
+	}
+
+	private static class RCVMenuItem {
+		public final String title;
+		public final SubredditCombinationAction action;
+
+		private RCVMenuItem(
+				final Context context,
+				final int titleRes,
+				final SubredditCombinationAction action) {
+
+			this.title = context.getString(titleRes);
+			this.action = action;
+		}
+	}
+
+	public static void showActionMenu(
+			final AppCompatActivity activity,
+			List<String> subredditNames) {
+
+		final RedditAccount user =
+				RedditAccountManager.getInstance(activity).getDefaultAccount();
+
+		if (user.isAnonymous()) {
+			return;
+		}
+
+		final ArrayList<RCVMenuItem> menu = new ArrayList<>();
+
+		final String[] menuText = new String[menu.size()];
+
+		for(int i = 0; i < menuText.length; i++) {
+			menuText[i] = menu.get(i).title;
+		}
+
+		final MaterialAlertDialogBuilder builder = new MaterialAlertDialogBuilder(activity);
+
+		builder.setItems(menuText, (dialog, which) -> onActionMenuItemSelected(
+				activity,
+				subredditNames,
+				user,
+				menu.get(which).action));
+
+		final AlertDialog alert = builder.create();
+		alert.setCanceledOnTouchOutside(true);
+		alert.show();
+	}
+
+	private static void onActionMenuItemSelected(
+			final AppCompatActivity activity,
+			final List<String> subredditNames,
+			final RedditAccount user,
+			final SubredditCombinationAction action) {
+	}
+}

src/main/java/org/quantumbadger/redreader/reddit/url/SubredditPostListURL.java

@@ -31,6 +31,8 @@
 import org.quantumbadger.redreader.reddit.things.SubredditCanonicalId;
 
 import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.Collections;
 import java.util.List;
 
 public class SubredditPostListURL extends PostListingURL {
@@ -452,4 +454,19 @@ public String humanReadableName(final Context context, final boolean shorter) {
 	public SubredditPostListURL changeSubreddit(final String newSubreddit) {
 		return new SubredditPostListURL(type, newSubreddit, order, limit, before, after);
 	}
+
+	public List<String> subredditNames() {
+		if (subreddit == null) {
+			return new ArrayList<>();
+		}
+
+		switch (type) {
+			case SUBREDDIT:
+				return Collections.singletonList(subreddit);
+			case SUBREDDIT_COMBINATION:
+				return Arrays.asList(subreddit.split("\\+"));
+			default:
+				return Collections.emptyList();
+		}
+	}
 }